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Derivative Financial Instruments (Location and Fair Value of Derivative Instruments) (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Derivatives not designated as hedging instruments, fair value    
Derivatives $ 93,702,000 $ 68,581,000
Derivatives $ 78,696,000 $ 61,419,000
Interest rate swap agreements on loans with commercial loan customers | Not Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative Asset, Number of Instruments Held 4 2
Derivative Asset, Notional Amount $ 59,167,000 $ 65,352,000
Derivative Asset, Average Remaining Maturity 5 years 3 months 14 days 4 years 9 months 29 days
Derivatives $ 291,000 $ 1,010,000
Derivative Liability, Number of Instruments Held 95 82
Derivative Liability, Notional Amount $ 849,409,000 $ 678,881,000
Derivative Liability, Average Remaining Maturity 6 years 5 months 8 days 7 years 7 months 9 days
Derivatives $ 78,696,000 $ 61,419,000
Interest rate swap agreements on loans with third-party counter parties | Not Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative Asset, Number of Instruments Held 99 84
Derivative Asset, Notional Amount $ 908,576,000 $ 744,233,000
Derivative Asset, Average Remaining Maturity 6 years 4 months 9 days 7 years 4 months 13 days
Derivatives $ 78,405,000 $ 60,409,000
Interest rate swap related to AFS securities | Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative Asset, Number of Instruments Held 11 11
Derivative Asset, Notional Amount $ 12,500,000 $ 12,500,000
Derivative Asset, Average Remaining Maturity 8 years 6 months 10 days 9 years 3 months 10 days
Derivatives $ 955,000 $ 602,000
Interest rate swap related to FHLB borrowings | Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative Asset, Notional Amount $ 96,400,000  
Derivative Asset, Average Remaining Maturity 2 years 8 months 12 days  
Interest rate swap related to wholesale funding | Designated as Hedging Instrument    
Derivatives not designated as hedging instruments, fair value    
Derivative Asset, Number of Instruments Held 32 11
Derivative Asset, Notional Amount $ 352,655,000 $ 116,400,000
Derivative Asset, Average Remaining Maturity 7 years 1 month 24 days 2 years 10 months 17 days
Derivatives $ 14,051,000 $ 6,560,000